Patrick Frazee (right) is facing first-degree murder charges after his fiancé, Kelsey Berreth (left), went missing on Thanksgiving Day. He's pictured in a booking photo provided by the Teller County Sheriff's office after he was arrested on Dec. 21 at his home in Colorado. (Uncredited / AP)

The fiancé of a Colorado woman who went missing on Thanksgiving Day has been formally charged with murder — and authorities are investigating the possibility that she was killed during a robbery.

Patrick Frazee, 32, made his first appearance in Teller County Court Monday and is now facing five counts in Kelsey Berreth’s murder.

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Berreth, 29, was reported missing by her mother on Dec. 2 and is presumed dead, as her body has yet to be found.

Frazee — who was arrested Dec. 21 on suspicion of murder and solicitation of murder — has been formally charged with two counts of murder in the first degree and three counts of solicitation to commit murder in the first degree, 4th Judicial District Attorney Dan May said at a news conference Monday.